<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>权限管理</el-breadcrumb-item>
      <el-breadcrumb-item>角色列表</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图 -->
    <el-card>
      <!-- 添加角色按钮区域 -->
      <el-row>
        <el-col>
          <el-button type="primary" @click="showAddRoleDialog">添加角色</el-button>
        </el-col>
      </el-row>

      <!-- 角色列表 -->
      <el-table :data="rolelist" border stripe>
        <!-- 展开列 -->
        <el-table-column type="expand">
          <template slot-scope="scope">
            <el-row
              :class="['bdbottom', i1 === 0 ? 'bdtop' : '', 'vcenter']"
              v-for="(item1, i1) in scope.row.children"
              :key="item1.id"
            >
              <!-- 渲染一级权限 -->
              <el-col :span="5">
                <el-tag closable @close="removeRightById(scope.row, item1.id)">{{item1.authName}}</el-tag>
                <i class="el-icon-caret-right"></i>
              </el-col>
              <!-- 渲染二级和三级权限 -->
              <el-col :span="19">
                <!-- 通过 for 循环嵌套渲染二级权限 -->
                <el-row
                  :class="[i2 === 0 ? '' : 'bdtop', 'vcenter']"
                  v-for="(item2, i2) in item1.children"
                  :key="item2.id"
                >
                  <el-col :span="6">
                    <el-tag
                      type="success"
                      closable
                      @close="removeRightById(scope.row, item2.id)"
                    >{{item2.authName}}</el-tag>
                    <i class="el-icon-caret-right"></i>
                  </el-col>
                  <el-col :span="18">
                    <el-tag
                      type="warning"
                      v-for="(item3, i3) in item2.children"
                      :key="item3.id"
                      closable
                      @close="removeRightById(scope.row, item3.id)"
                    >{{item3.authName}}</el-tag>
                  </el-col>
                </el-row>
              </el-col>
            </el-row>
            <!-- <pre>{{scope.row}}</pre> -->
          </template>
        </el-table-column>
        <!-- 索引列 -->
        <el-table-column label="#" type="index"></el-table-column>
        <el-table-column label="角色名称" prop="roleName"></el-table-column>
        <el-table-column label="角色描述" prop="roleDesc"></el-table-column>
        <el-table-column label="操作" width="300px">
          <template slot-scope="scope">
            <el-button size="mini" type="primary" icon="el-icon-edit" @click="showEditDialog(scope.row.id)">编辑</el-button>
            <el-button size="mini" type="danger" icon="el-icon-delete" @click="removeRoleById(scope.row.id)">删除</el-button>
            <el-button
              size="mini"
              type="warning"
              icon="el-icon-setting"
              @click="showSetRightDialog(scope.row)"
            >分配权限</el-button>
          </template>
        </el-table-column>
      </el-table>
    </el-card>

    <!-- 添加角色的对话框 -->
    <el-dialog title="添加角色" :visible.sync="addRoleDialogVisible" width="50%" @close="addRoleDialogClosed">
      <!-- 添加角色的表单 -->
      <el-form
        :model="addRoleForm"
        :rules="addRoleFormRules"
        ref="addRoleFormRef"
        label-width="100px"
      >
        <el-form-item label="角色名称" prop="roleName">
          <el-input v-model="addRoleForm.roleName"></el-input>
        </el-form-item>
        <el-form-item label="角色描述" prop="roleDesc">
          <el-input v-model="addRoleForm.roleDesc"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addRoleDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addRole">确 定</el-button>
      </span>
    </el-dialog>

    <!-- 修改角色信息的对话框 -->
    <el-dialog title="修改角色" :visible.sync="editDialogVisible" width="50%" @close="editDialogClosed">
      <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="100px">
        <el-form-item label="角色名称" prop="roleName">
          <el-input v-model="editForm.roleName"></el-input>
        </el-form-item>
        <el-form-item label="角色名称" prop="roleDesc">
          <el-input v-model="editForm.roleDesc"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editRoleName">确 定</el-button>
      </span>
    </el-dialog>

    <!-- 分配权限的对话框 -->
    <el-dialog title="分配权限" :visible.sync="setRightDialogVisible" width="50%" 
    @close="setRightDialogClosed">
      <!-- 树形控件 -->
      <el-tree :data="rightslist" :props="treeProps" show-checkbox node-key="id" 
      default-expand-all :default-checked-keys="defKeys" ref="treeRef"></el-tree>
      <span slot="footer" class="dialog-footer">
        <el-button @click="setRightDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="allotRights">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  data() {
    return {
      // 所有角色列表数据
      rolelist: [],
      // 控制分配权限对话框的显示与隐藏
      setRightDialogVisible: false,
      // 所有权限的数据
      rightslist:[],
      // 树形控件的属性绑定对象
      treeProps: {
          label: 'authName',
          children: 'children'
      },
      // 默认选中的节点 id 值数据
      defKeys: [],
      // 当前即将分配权限的角色id
      roleId: '',
      // 控制添加角色对话框的显示与隐藏
      addRoleDialogVisible: false,
      // 添加角色的表单数据对象
      addRoleForm: {
        // 将要添加的角色的名称
        roleName: '',
        // 将要添加的角色描述
        roleDesc: ''
      },
      // 添加角色表单的验证规则对象
      addRoleFormRules: {
        roleName: [
          { required: true, message: "请输入角色名称", trigger: "blur" },
        ],
        roleDesc: [
          { required: true, message: "请输入角色描述", trigger: "blur" },
        ]
      },
      // 控制修改角色对话框的显示与隐藏
      editDialogVisible: false,
      // 查询到的角色的表单数据对象
      editForm: {},
      // 修改角色表单的验证规则对象
      editFormRules: {
        roleName: [
          { required: true, message: "请输入角色名称", trigger: "blur" },
        ],
        roleDesc: [
          { required: true, message: "请输入角色描述", trigger: "blur" },
        ]
      },
    };
  },
  created() {
    this.getRolesList();
  },
  methods: {
    // 获取所有角色的列表
    async getRolesList() {
      const { data: res } = await this.$http.get("roles");
      if (res.meta.status !== 200) {
        return this.$message.error("获取角色列表失败！");
      }

      this.rolelist = res.data;
      //console.log(this.rolelist);
    },
    // 点击按钮，展示添加角色的对话框
    showAddRoleDialog() {
      this.addRoleDialogVisible = true;
    },
    // 点击按钮，添加新的角色
    addRole() {
      this.$refs.addRoleFormRef.validate(async valid => {
        if (!valid) return
        const {data: res} = await this.$http.post('roles', this.addRoleForm)
        if (res.meta.status !== 201) {
          return this.$message.error('添加角色失败！')
        }
        this.$message.success('添加角色成功！')
        this.getRolesList()
        this.addRoleDialogVisible = false
      })
    },
    // 监听对话框的关闭事件，重置表单数据
    addRoleDialogClosed() {
      this.$refs.addRoleFormRef.resetFields()
      this.addRoleForm = {}
    },
    // 展示编辑角色信息的对话框
    async showEditDialog(id) {
      const { data: res } = await this.$http.get("roles/" + id);
      if (res.meta.status !== 200) {
        return this.$message.error("查询角色信息失败！");
      }
      //console.log(res.data);
      this.editForm = res.data;
      this.editDialogVisible = true;
    },
    // 监听修改角色信息对话框的关闭事件
    editDialogClosed() {
      this.$refs.editFormRef.resetFields();
    },
    // 修改角色信息并提交
    editRoleName() {
      this.$refs.editFormRef.validate(async valid => {
        if (!valid) return;
        // 发起角色信息的数据请求
        const { data: res } = await this.$http.put(
          "roles/" + this.editForm.roleId,
          {
            roleName: this.editForm.roleName,
            roleDesc: this.editForm.roleDesc
          }
        );
        if (res.meta.status !== 200) {
          return this.$message.error("编辑角色信息失败！");
        }

        // 关闭对话框
        this.editDialogVisible = false;
        // 刷新数据列表
        this.getRolesList();
        // 提示修改成功
        this.$message.success("编辑角色信息成功！");
      });
    },
    // 根据id删除对应的角色信息
    async removeRoleById(id) {
      //弹框询问用户是否删除数据
      const confirmResult = await this.$confirm(
        "此操作将永久删除该角色 , 是否继续?",
        "提示",
        {
          confirmButtonText: "确定",
          cancelButtonText: "取消",
          type: "warning"
        }
      ).catch(err => err);

      // 如果用户确认删除，则返回值为字符串 confirm
      // 如果用户取消了删除，则返回值为字符串 cancel
      //console.log(confirmResult);
      if (confirmResult !== "confirm") {
        return this.$message.info("已取消删除");
      }

      const { data: res } = await this.$http.delete("roles/" + id);
      if (res.meta.status !== 200) {
        return this.$message.error("删除角色失败！");
      }
      this.$message.success("删除角色成功！");
      this.getRolesList();
    },
    // 根据 id 删除对应的权限
    async removeRightById(role, rightId) {
      // 弹框提示用户是否要删除
      const confirmResult = await this.$confirm("此操作将永久删除该文件, 是否继续?", "提示", {
        confirmButtonText: "确定",
        cancelButtonText: "取消",
        type: "warning"
      }).catch(err => err)

      if (confirmResult !== 'confirm') {
        return this.$message.info('取消了删除！')
      }

      const {data:res} = await this.$http.delete(`roles/${role.id}/rights/${rightId}`)

      if (res.meta.status !== 200) {
        return this.$message.error('删除权限失败！')
      }

      //this.getRolesList()
      role.children = res.data
      
    },
    // 展示分配权限的对话框
    async showSetRightDialog(role) {
        this.roleId = role.id
        // 获取所有权限的数据
        const {data: res} = await this.$http.get('rights/tree')
        if (res.meta.status !== 200) {
            return this.$message.error('获取权限数据失败！')
        }
        // 把获取到的权限数据保存到 data 中
        this.rightslist = res.data
        //console.log(this.rightslist);

        // 递归获取三级节点的 id
        this.getLeafKeys(role, this.defKeys)
        
        this.setRightDialogVisible = true
    },
    // 通过递归的形式，获取角色下所有三级权限的 id，并保存到 defKeys 
    // 数组中
    getLeafKeys(node, arr) {
        // 如果当前 node 节点不包含 children 属性，则是三级节点
        if (!node.children) {
            return arr.push(node.id)
        }
        node.children.forEach(item => {
            this.getLeafKeys(item, arr)
        });
    },
    // 监听分配权限对话框的关闭事件
    setRightDialogClosed(){
        this.defKeys = []
    },
    // 点击为角色分配权限
    async allotRights() {
        const keys = [
            ...this.$refs.treeRef.getCheckedKeys(),
            ...this.$refs.treeRef.getHalfCheckedKeys()
        ]
        const idStr = keys.join(',')
        const {data: res} = await this.$http.post(`roles/${this.roleId}/rights`, {rids: idStr})
        
        if (res.meta.status !== 200) {
            return this.$message.error('分配权限失败！')
        }
        this.$message.success('分配角色成功！')
        this.getRolesList()
        this.setRightDialogVisible = false
    }
  }
};
</script>

<style lang="less" scoped>
.el-tag {
  margin: 7px;
}

.bdtop {
  border-top: 1px solid #eee;
}

.bdbottom {
  border-bottom: 1px solid #eee;
}

.vcenter {
  display: flex;
  align-items: center;
}
</style>